/*-
 * ‌
 * Hedera Mirror Node
 * ​
 * Copyright (C) 2019 Hedera Hashgraph, LLC
 * ​
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * ‍
 */

syntax = "proto3";

package com.hedera.mirror.api.proto;

/**
 * Required for the reactor-grpc generator to work correctly
 */
option java_multiple_files = true;

option java_package = "com.hedera.mirror.api.proto";

import "basic_types.proto";
import "timestamp.proto";
import "consensus_submit_message.proto";

message ConsensusTopicQuery {
    /**
     * A required topic ID to retrieve messages for.
     */
    .proto.TopicID topicID = 1;

    /**
     * Include messages which reached consensus on or after this time. Defaults to current time if
     * not set.
     */
    .proto.Timestamp consensusStartTime = 2;

    /**
     * Include messages which reached consensus before this time. If not set it will receive
     * indefinitely.
     */
    .proto.Timestamp consensusEndTime = 3;

    /**
     * The maximum number of messages to receive before stopping. If not set or set to zero it will
     * return messages indefinitely.
     */
    uint64 limit = 4;
}

message ConsensusTopicResponse {
    /**
     * The time at which the transaction reached consensus
     */
    .proto.Timestamp consensusTimestamp = 1;

    /**
     * The message body originally in the ConsensusSubmitMessageTransactionBody. Message size will
     * be less than 6KiB.
     */
    bytes message = 2;

    /**
     * The running hash (SHA384) of every message.
     */
    bytes runningHash = 3;

    /**
     * Starts at 1 for first submitted message. Incremented on each submitted message.
     */
    uint64 sequenceNumber = 4;

    /**
     * Version of the SHA-384 digest used to update the running hash.
     */
    uint64 runningHashVersion = 5;

    /**
     * Optional information of the current chunk in a fragmented message.
     */
    .proto.ConsensusMessageChunkInfo chunkInfo = 6;
}

/**
 * The Mirror Service provides the ability to query a stream of Hedera Consensus Service (HCS)
 * messages for an HCS Topic via a specific (possibly open-ended) time range.
 */
service ConsensusService {
    rpc subscribeTopic (ConsensusTopicQuery) returns (stream ConsensusTopicResponse);
}